Layer 3
Data-link layer
A device that opens and closes a circuit is called a switch.
Physical layer
Function controller
No, a lava lamp is not considered a type of optical device.
its a switch
Toggle = back and forth, or on and off. A toggle switch toggles (turns) a light or other device on or off. Good example is a light switch (the wall kind)-- a toggle switch must also be of the "throw the stick back and forth" kind. Which a light switch basically is.
A puff and suck switch is a device that a person wears where a tube goes into the mouth, and then they can puff and suck to select different things. It's like a kind of mouse for the computer except you operate it with your mouth.
computer is a electronic device
A storage device.
This kind of a hard disk device is the most commontly use in office.
A linear electronic device is one where output is linearly proportional, in some way, to input. An example is an amplifier. A non-linear device is one where the input drives the circuit into some kind of saturation mode. An example is a switch, such as is used in TTL IC's.